The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 13, 2007
Filed:
Jan. 10, 2005
Eiichiro Fukuchi, Tokyo, JP;
Akira Kakinuma, Tokyo, JP;
Kenya Takagawa, Tokyo, JP;
Fumitaka Baba, Tokyo, JP;
Taku Murase, Tokyo, JP;
Eiichiro Fukuchi, Tokyo, JP;
Akira Kakinuma, Tokyo, JP;
Kenya Takagawa, Tokyo, JP;
Fumitaka Baba, Tokyo, JP;
Taku Murase, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
The present invention provides a Mn—Zn ferrite which is low in the loss in the frequency range between a few 10 kHz and a few 100 kHz and high in the saturation magnetic flux density in the vicinity of 100° C. The present invention comprising the steps of compacting a powder having a specific surface area (based on the BET method) of 2.0 to 5.0 m/g and a 50% particle size of 0.7 to 2.0 μm into a compacted body having a predetermined shape and obtaining a sintered body by sintering the compacted body. It is preferable that a Mn—Zn ferrite comprises, as main constituents, 54 to 57 mol % of FeO, 5 to 10 mol % of ZnO, 4 mol % or less (not inclusive of 0%) of NiO, and the balance substantially being MnO.